Questions on H1b and EAD

Question

People working on EAD are they allowed to work for any employer or decide not to work, is that true?
Can those people work in military in that case?

ALso, can they change their status to temporary GC thorugh employment?

Answer 1

Generally, EAD is given for open employment, however, the US Government may discriminate against non-citizens and non-residents when it comes to National security reasons.